A grab rail and a muffler support structure has a reduced number of components and a simplified structure. Therefore, the cost is reduced. A grab rail is attached to the rear portion of seat rails supporting a seat. The grab rail is provided with left mount holes and right mount holes serving as a mount portion used to attach the grab rail to the seat rails. A muffler support for supporting the muffler of an exhaust system is also provided. The grab rail also serves as the muffler support.